Malicious PDF — malware analysis report

Static analysis result for SHA-256 511038eb539a21e1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 02:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f02eb0d422a1a9d5994594b2282ad3a0 SHA-1: bb091c6bd9a520e928b4e27a93babbfa243f5b19 SHA-256: 511038eb539a21e12c50089dcf5fa4871853a2a95f6b3c5af78578b2c27ce1af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ettermanenterprises.com/ckfinder/userfiles/files/37735212930.pdf In PDF document text
    • http://yourtruck.be/upload/ckeditor/file/17613725287.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/52540043185.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/6347721706.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/92662558865.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/dukefadigizutuxuz.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/97512002462.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/fanokonikorekifibozori.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0ur1svb7eise9vpn9s5j9mlopv/zelewiludowis.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/nedejawuwuvuzitutulozesa.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/72002894.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/41939039677.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139148152609---67591334890.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/55302246843.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/95992074605.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/99091296628.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/58588755569.pdfIn PDF document text
    • http://grandfiltr.com/files/file/vegegedanabuwevumunulo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/taximawiwarosogikopezitu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/78875287086.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/q14bekiptduc2h3pjvkce27lou/98198241972.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/tobijuna.pdfIn PDF document text
    • http://viorina-deko.com/images/file/xixinodumupifegekusav.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wulipuwazupikijig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nike+fitness+app+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 10512 bytes
SHA-256: 5682b48e6c64a56069e0b993f1719c423effdb6090119f48aae54677a546c7a2
font_01_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16492 bytes
SHA-256: 3244fd20da592c9ca3b5291b1251880aeb9211b440cd5f824fd4641d36e4bdfa